Keypair Generation

This page allows you to generate cryptographic public/private keypairs for several popular algorithms.

• RSA keypairs for asymmetric encryption and signatures
• Ed25519 keypairs for fast, secure digital signatures
• ECDSA keypairs on curves P-256 and P-384

Features:

• Choose between RSA, Ed25519, and ECDSA keypair generation
• Select key size (RSA) or elliptic curve (ECDSA)
• View both public and private keys side-by-side
• Fully browser-based key generation

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Private and Secure: Fully client-side — your keys are never sent anywhere.

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Algorithm: RSA Ed25519 ECDSA

RSA Key Size: 2048 bits 3072 bits 4096 bits

ECDSA Curve: P-256 P-384

Public Key (PEM)

Private Key (PEM)

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Supported Key Types

Algorithm	Type	Key Sizes / Curves	Use Case	Recommended For	Notes
RSA	Asymmetric	2048, 3072, 4096 bits	Encryption and Signing	TLS certificates, email encryption, VPNs	Versatile but slower; large keys
Ed25519	Asymmetric	Fixed curve	Signing only	Modern apps, secure APIs, blockchain	Very fast, highly secure; preferred for new projects
ECDSA	Asymmetric	P-256, P-384 curves	Signing only	Mobile apps, IoT devices, authentication tokens	Efficient signatures with small keys

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Notes:

• RSA supports both encryption and signing, but is slower and produces larger keys compared to elliptic curve algorithms.
• Ed25519 is strongly recommended for new signature systems — fast, simple, and secure.
• ECDSA is excellent for systems where key size and bandwidth matter (e.g., mobile, IoT).

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